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Smith started the show with an elaborate, digitally-animated skydive from Nickelodeon's trademark blimp. Smith was then hoisted from the rafters to the stage of the Galen Center in Los Angeles, where thousands of glow-stick waving fans cheered him on — including first lady Michelle Obama.

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The slime, a Kids Choice Awards tradition, started early. Buckets of it were dropped on the front rows of fans.

Smith promised "the most ever slime, ever." Within minutes, actress Halle Berry was covered with it.

For the KCAs, kids vote for their favorites in film, music, sports and TV.